/*
 * Copyright 2010-2020 Alfresco Software, Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.activiti.engine.impl.cmd;

import java.util.Map;
import org.activiti.engine.ActivitiException;
import org.activiti.engine.ActivitiIllegalArgumentException;
import org.activiti.engine.ActivitiObjectNotFoundException;
import org.activiti.engine.impl.interceptor.Command;
import org.activiti.engine.impl.interceptor.CommandContext;
import org.activiti.engine.impl.persistence.deploy.DeploymentManager;
import org.activiti.engine.impl.persistence.entity.MessageEventSubscriptionEntity;
import org.activiti.engine.impl.runtime.ProcessInstanceBuilderImpl;
import org.activiti.engine.impl.util.ProcessInstanceHelper;
import org.activiti.engine.repository.ProcessDefinition;
import org.activiti.engine.runtime.ProcessInstance;

/**


 */
public class StartProcessInstanceByMessageCmd implements Command<ProcessInstance> {

    protected String messageName;
    protected String businessKey;
    protected Map<String, Object> processVariables;
    protected Map<String, Object> transientVariables;
    protected String tenantId;

    public StartProcessInstanceByMessageCmd(
        String messageName,
        String businessKey,
        Map<String, Object> processVariables,
        String tenantId
    ) {
        this.messageName = messageName;
        this.businessKey = businessKey;
        this.processVariables = processVariables;
        this.tenantId = tenantId;
    }

    public StartProcessInstanceByMessageCmd(ProcessInstanceBuilderImpl processInstanceBuilder) {
        this.messageName = processInstanceBuilder.getMessageName();
        this.businessKey = processInstanceBuilder.getBusinessKey();
        this.processVariables = processInstanceBuilder.getVariables();
        this.transientVariables = processInstanceBuilder.getTransientVariables();
        this.tenantId = processInstanceBuilder.getTenantId();
    }

    public ProcessInstance execute(CommandContext commandContext) {
        if (messageName == null) {
            throw new ActivitiIllegalArgumentException(
                "Cannot start process instance by message: message name is null"
            );
        }

        MessageEventSubscriptionEntity messageEventSubscription = commandContext
            .getEventSubscriptionEntityManager()
            .findMessageStartEventSubscriptionByName(messageName, tenantId);

        if (messageEventSubscription == null) {
            throw new ActivitiObjectNotFoundException(
                "Cannot start process instance by message: no subscription to message with name '" +
                messageName +
                "' found.",
                MessageEventSubscriptionEntity.class
            );
        }

        String processDefinitionId = messageEventSubscription.getConfiguration();
        if (processDefinitionId == null) {
            throw new ActivitiException(
                "Cannot start process instance by message: subscription to message with name '" +
                messageName +
                "' is not a message start event."
            );
        }

        DeploymentManager deploymentCache = commandContext.getProcessEngineConfiguration().getDeploymentManager();

        ProcessDefinition processDefinition = deploymentCache.findDeployedProcessDefinitionById(processDefinitionId);
        if (processDefinition == null) {
            throw new ActivitiObjectNotFoundException(
                "No process definition found for id '" + processDefinitionId + "'",
                ProcessDefinition.class
            );
        }

        ProcessInstanceHelper processInstanceHelper = commandContext
            .getProcessEngineConfiguration()
            .getProcessInstanceHelper();
        ProcessInstance processInstance = processInstanceHelper.createAndStartProcessInstanceByMessage(
            processDefinition,
            businessKey,
            messageName,
            processVariables,
            transientVariables
        );

        return processInstance;
    }
}
